Joachim Leonfellner
Founder & CTO at www.johnnys.page
Vienna, Austria
Summary
👤
Senior🎓
Top SchoolJoachim Leonfellner is a founder and CTO based in Vienna with 11 years of hands-on experience building mobile-first and full-stack software products. He blends indie-dev curiosity with startup leadership, having founded multiple ventures including H3Y.studio and Toby App while maintaining a public portfolio, blog, and CV that reflect continuous learning. A former Microsoft technical evangelist and contributor to the popular App Center SDK for .NET (adding macOS support for Analytics and Crashes), he’s comfortable shipping cross-platform tooling and improving build infrastructures. With an academic background in Mobile Computing and Information Engineering, he pairs practical engineering with security-minded credentials (CISSP) and a globe-trotting remote-first workstyle.
11 years of coding experience
5 years of employment as a software developer
Master of Science (MSc), Information Engineering and Management, Master of Science (MSc), Information Engineering and Management at University of Applied Sciences Upper Austria - Hagenberg CampusHLW for Communications- and Mediadesign
English, Spanish
Github Skills (9)
net10
asp-net10
xamarin10
macos10
dotnet10
mobile-development10
appcenter10
dotnet-core9
csharp9
Programming languages (14)
Github contributions (5)
microsoft/appcenter-sdk-dotnet
Sep 2021 - Sep 2021
Development repository for the App Center SDK for .NET platforms, including Xamarin
Role in this project:
Mobile Developer
Mobile DeveloperContributions:6 commits, 1 PR, 7 comments in 1 day
Contributions summary:Joachim primarily contributed to the integration of macOS support within the .NET App Center SDK. They added and modified bindings for macOS, specifically for Analytics and Crashes, including API definitions and project configurations. This involved porting existing iOS-related code and references to macOS, creating the necessary infrastructure for these App Center features to function on macOS platforms. Furthermore, they updated build scripts and file references to include macOS builds.
app-centerdotnetuwpcenterplatforms
nor0x/OpenSee
Mar 2022 - Apr 2022
OpenSea downloader - get full collections without login or API Key 🔓
Contributions:87 commits, 7 PRs, 60 pushes in 1 month
apidownloaderopenseadotnet-mauinft
Find and Hire Top DevelopersWe’ve analyzed the programming source code of over 60 million software developers on GitHub and scored them by 50,000 skills. Sign-up on Prog,AI to search for software developers.